target city on this night. >> search the residence. san leandro. >> initial contact is the most dangerous. robot slide around to the left. >> reporter: special agents from the california department of justice are on the hunt. >> it appears nobody is home like now. >> reporter: they keep moving door-to-door, day into night, looking for a number of people -- . >> next one up is no. 6. >> reporter: people who they say lost their rights to own guns, but who still have them. >> people have security doors and you can't see behind the security door when you are on the outside. >> reporter: he talks about the unknown and that is critical to point out because these agents really never know what they are going to find. this instance they knocked on the door of a woman that the state deemed mentally disabled. had he we want to have a 9 millimeter and she it and she found the ammunition that goes with it. >> she is prohibited until 2017. >> reporter: 19,374, the number of armed, prohibited persons in california who in all van estimated 34,000 guns